Pumping jack



1942- A. R. MAIER 2,271,086

PUMPING JACK Filed July 27, 1939 INVENTOR:

flaw/5T E. MAI/EB,

Hi5 ORNEY.

Patented Jan. 27, 1942 7 PUMPING JACK August R. Maier, Dallas, Tern,assignor to Oil Well Supply Company, a corporation of New JerseyApplication July 27, 1939, Serial No. 286,900 I 8 Claims.

This invention relates to improvements in pumping jacks such as used inconnection with oil Well pumping apparatus.

One object of the invention is to provide a pumping jack of simple andrugged construction. Another object is to provide a rigid supportingbase with a unitary walking beam and -V-a'ssembly adjustably securedthereto. Another object is to provid novel means of adjustably securinga walking beam, V-assembly and trunnion to an integral supporting base.A further object is to provide a unitary walking beam assembly which canbe inexpensively and conveniently mounted on a solid base and readilysupportable without likelihood of misalignmentor loss of parts. A

further object is to provide a rugged pumping jack assembly devoid ofbolted joints constructed and arranged to prevent weaving.

The foregoing and further featuresof the invention will be fullyapparent from the following detail disclosure, when read in connectionwith the accompanying drawing, in which:

Figure 1 is a side elevation of an oil well pumping jack embodying theinvention;

Figure 2 is a section on line IIII of Figure 1;

Figure 3 is a plan of the base member; and

Figure 4 is a side view of the walking beam assembly.

In the pumping jack of the present invention, the unitary walking beam land V-assembly include an arm l2 perpendicular to the beam It and astrut l4 disposed obliquely thereto, the parts being integrated bywelded joints, as indicated at l6, l8 and 20. Similarly, the mulehead orlink hanger 22 can be welded to the outer end of the walking beam, andthe trunnion 24 is Welded to an intermediate part thereof, Thus it isclear that all of the component elements of the walking beam andV-assembly are integrated one with the other, these parts being shopfabricated and being well adapted for nesting during shipment.

The pumping jack base, indicated generally at 26, comprises oblique legs28, 30, 32 and 34 which at their lower ends are welded at the cornerintersections of a rectangular frame,

sides of the slot 48, there are bearings 50 and 52 which are attached'bybolts 54 passing through slots 56 so as to permit of a slidingadjustment which is accomplished by suitably adjusting the composed ofparallel side members 36 and 38 therethrough. On the top plate 44, atopposite screws 58 threaded through lugs 59, as shown.

The perpendicular arm I2 of the V-assembly is drilled at a plurality ofpoints for the reception of suitable bolts by means of which a bearing60 can be secured in various positions of radial adjustment for thereception ofa pin 62 for connecting a pull rod 64 with the arm.

'In the construction described, the main units of the jack are only twoin number; namely the base or Samson post and the walkingbeam with itsintegrated V-assembly; This facilitates erection in the field and avoidserecting troubles usually associated with oil field apparatus due toloss or misplacement of parts. The only bolts used in the assemblage arethose for the attachment of the bearings'50, 52 and 60, and theadjustingbolts 58. These are all wiredin place during shipment. The integratedconstruction ofthe parts is made practical bythe provision of the basewith the slotted or U-shaped top plate which permits easy assemblage ofthe parts and provides ample room for'the rocking motion of the Walkingbeam arm. 7 The" main component parts'arethus so constructed andarranged that they can be nested in a small bulk unit for shipment andeasily and quickly erected upon arrival at their destination.

Heretofore the base for an oil well pumping jack has usually been splitlongitudinally and the walking beam arm and strut corresponding to theV-assembly herein described were separate parts. In the conventionalprior art units the trunnion is also a separate part. According to thepresent invention the trunnion forms an integral part of the walkingbeam and V-assembly. Thus the invention provides a simplified assemblagewhose main elements are devoid of bolted joints and can be more easilyand quickly erected on location with less likelihood of error andmisplacement orloss of parts than is the case in prior constructions.

While I have described quite precisely the particular embodiment of theinvention illustrated, it is to be understood that variations thereofmay be made by those skilled in the art without departure from theinvention as defined in the appended claims.

I claim:

1. A pumping jack of the character described comprising a unitary basehaving a U-shaped top plate secured thereto, a walking beam havingintegrated therewith a V-assembly consisting of an arm perpendiculartherewith and a strut inclined thereto, bearings supported on the plate,and a trunnion formed as an integral part of the walking beam mounted insaid bearing.

2. A pumping jack comprising a base supporting a U-shaped slotted plate,a walking beam having an arm perpendicular thereto extending through theslot of the plate, a strut uniting respectively the outer portions ofthe walking beam and arm, the walking beam, arm and strut all beingsecured to one another by welded joints, bearings mounted on said topplate, and a trunnion pin welded to the walking beam and mounted by saidbearings.

3. A pumping jack comprising a base including a top plate with an openended slot formed therein, a walking beam having an integral trunnionpivotally mounted by bearings secured to said plate, said walking beamhaving an integral arm perpendicular thereto arranged to rock freelythrough the slot in the plate, and a strut integrally connected with theouter portions, re spectively, of the walking beam and said arm.

4. A pumping jack-of the character described comprising a rectangularframe, a top plate with an open ended slot therein, legs joining saidframe to the top plate, bearings adjustably secured to the top plate, awalking'beam having a trunnion pin and mounted by said bearings, an armextending through the slot in the top plate and integrally secured tothe walking beam,

and a diagonal strut integrally united to the outer portions of thewalking beam and arm.

5. A pumping jack including a unitary walking beam having a beam and adepending arm forming a reentrant angle therebetween in the plane ofmovement of the walking beam, a transverse trunnion secured to thewalking beam in said angle, a unitary base having a top plate extendingtransversely of the said plane of the walking beam and having a slot inone end thereof for receiving the beam arm, and trunnion bearingsremovably secured to the plate on opposite sides of the slot forassembling the jack, said slot extending inwardly of said plate asufficient distance to permit of free rocking movement of the beam armupon the trunnion.

6. A pumping jack including a unitary walking beam having a beam and 2.depending arm forming a reentrant angle therebetween in the plane ofmovement of the walking beam, a transverse trunnion secured to thewalking beam in the apex of said angle, a unitary base having a topplate extending transversely of the said plane of the walking beam andhaving a slot in one end thereof for receiving the beam arm, andtrunnion bearings removably secured to the plate on opposite sides ofthe slot for assembling the jack, said slot extending inwardly of saidplate a suificient distance to permit of free rocking movement of thebeam arm upon the trunnion.

7. A pumping jack including a unitary walking beam having a beam, anintermediately depending arm and a strut inclined between and connectingone end of the beam and the arm, a trunnion secured to the walking beamon the opposite side thereof from said strut in the angle formed by saidarm and the other end of the beam, said trunnion being transverse to theplane of movement of the walking beam, a unitary base having a top plateextending transversely of the said plane of the walking beam and havingan open-ended slot in one end thereof for receiving the beam arm, andtrunnion bearings removably secured to the plate on opposite sides ofthe slot for assembling the jack, said slot extending inwardly of saidplate a sufficient distance to permit of free rocking movement of thebeam arm upon the trunnion.

8. A pumping jack including a unitary walking beam having a beam and adepending arm forming a reentrant angle therebetween in the plane ofmovement of the walking beam, transversely disposed means secured to thewalking beam in said angle for pivotally mounting said walking beam, abase having a top plate extending transversely of the said plane of thewalking beam and having a slot in one end thereof for receiving the beamarm, and means supporting the walking beam by the pivotal mountingthereof, said supporting means being removably secured to the plate onopposite sides of the slot for assembling the jack.

AUGUST R. MAIER.

